Hoisting truck having boom means comprising a tension fulcrum bar



Sept. 27, 1966 G. R. MEYER 3,275,296

HOISTING TRUCK HAVING BOOM MEANS COMPRISING A TENSION FULCRUM BAR Filed April 12, 1965 2 SheetsSheet 1 I NVENTOR.

Gera/o R Me 6/ "WWW ATTORNEY Sept. 27, 1966 G. R. MEYER 3,275,295

HOISTING TRUCK HAVING BOOM MEANS COMPRISING A TENSION FULGRUM BAR Filed April 12, 1965 2 Sheets-Sheet 2 I NVENTOR Gera/c/ 2. M6 er MM ATTORNEY United States Patent Office 3,275,296 Patented Sept. 27, 1966 3 275 296 I-IOISTING TRUCK HAiVIPdG BOOM MEANS COM- PRISING A TENSION FULCRUM BAR Gerald Raymond Meyer, Centerville, Mich., assignor to himself and Richard I. Ward, Three Rivers, Mich, as joint tenants with right of survivorship Filed Apr. 12, 1965, Ser. No. 447,223 Claims. (Cl. 254-8) This invention resides in the mechanical arts. More particularly, it relates to lifting apparatus.

In garages and the like it is frequently necessary to remove, and replace engines of automobiles, trucks, buses, tractors, and the like. Heretofore, this has been accomplished by means of an overhead hoist of the block and tackle type. Such hoists, however, particularly with heavy loads on them, are difficult to operate and are limited in movement from one place to another. A problem to which this invention contributes a solution is to provide a hoist which avoids these disadvantages.

In summary, this invention comprises a hoist. The hoist, which in a preferred embodiment is portable, comprises: (l) a boom, (2) a jack having a base end and lift means disposed for up and down movement relative to said base end, (3) pivotal connection means connecting said boom between the ends thereof to the lift means and permitting pivotal movement of the boom in a vertical plane, (4) fulcrum means pivotally connected to the boom in a region extending from one end of the boom to the means pivotally connecting the boom to the lift means, which means provide said boom with a fulcrum, and (5) load holding means attached to the boom in a region extending from the other end of the boom to the means pivotally connecting said boom to the lift means. In a preferred embodiment of the hoist of this invention the jack is hydraulic. Moreover, in a preferred embodiment of the hoist of this invention the jack is supported on a frame mounted on wheels. Furthermore, in a preferred specific embodiment of this invention the lift means comprises a fork arm structure for the undercarriage of an automobile chassis or the like.

This invention is further described relative to the drawings which com-prise a material part of the disclosures,

In the drawings:

FIG. 1 is a perspective view of a preferred specific embodiment of the hoist of this invention;

FIG. 2 is a horizontal cross sectional View of part of the hoist of FIG. 1, which view has been taken as indicated by the sectioning line 22 of FIG. 1, and with a portion of the fork arm structure removed to reveal an underlying part;

FIG. 3 is another horizontal cross sectional view of part of the hoist of FIG. 1, which view has been taken as indicated by the sectioning line 33 of FIG. 1;

FIG. 4 is a vertically partially cross sectioned front view of part of the hoist of FIG. 1;

FIG. 5 is a partially sectioned view of the bottom of the fulcrum end portion of the hoist of FIG. 1, which view has been taken as indicated by the lines 55 in FIG. 1;

FIG. 6 is a vertical, cross sectional view of a portion of the boom of the hoist of FIG. 1, which view has been taken as indicated by the sectioning line 6-6 of FIG. 1; and

FIG. 7 is a longitudinal, cross sectional view of the load carrying end portion of the boom of the hoist of FIG. 1.

More specifically, FIG. 1 illustrates a portable hoist 10 of this invention. The portable hoist comprises a boom 12, a hydraulic jack 14 for elevating and lowering the boom, a fulcrum bar 16, and a support frame 18 for the hydraulic jack.

The boom 12 comprises a length of pipe 20. In the region of one end of the pipe 20, as shown in FIG. 5, a bottom segment of the pipe wall extending to said end has been removed and the pipe wall on each side thereof fiattened and provided with retention bolt holes 23. This end of the pipe 20, the fulcrum end of the boom 12, thereby provides a space 22 for receiving the top end of the fulcrum bar 16. The opposite end of the pipe 20 as shown in FIG. 7 is open and contains, concentrically disposed therein, an extension pipe 24. The extension pipe 24 is open at both ends. In the region of the outer end of the extension pipe 24, the upper portion of the wall thereof is cut away for access to the interior of the extension pipe. In the region of said opposite end of the pipe 20 there are a pair of vertically aligned and diametrically disposed retention bolt holes 26 while the extension pipe along the length thereof comprises spaced apart pairs of vertically aligned and diametrically disposed retention bolt holes 28. By means of a retention bolt and nut assembly 30 with the retention bolt disposed in the bolt holes 26 of the main pipe 20 and a selected pair of bolt holes 28 in the extension pipe 24 the extension pipe 24 is secured in position to the main pipe 20. Within the extension pipe the retention bolt passes through a link of a load carrying chain 32 which extends through the extension pipe 20 and hangs downwardly therefrom at the outer end thereof.

The bottom end of the load carrying chain 32 carries a hook 34 for attachment to a load. Between the load carrying end and the fulcrum end of the boom 12, the main pipe 20, as best shown in FIG. 6, comprises a pair of mounting blocks 36, one on one side of the main pipe 20 and the other diametrically opposed on the other side of the main pipe. Both mounting blocks 36 are secured to the main pipe 20 as by weldment and extend downwardly below it. Between the mounting blocks 36 in sliding fit is a mounting sleeve 38. This is a short length of pipe, the upper end of which is spaced below the main pipe 20 a sufiicient distance to clear the main pipe 20 when the boom 12 is inclined at normally encountered angles to the horizontal. The mounting blocks 36 comprise a pair of oppositely disposed, normally horizontally aligned, mounting bolt holes 40. The upper end portion of the sleeve 38 likewise comprises a pair of diametrically disposed mounting bolt holes 42. The mounting sleeve 38 is pivotally secured to the mounting blocks 36 by means of a mounting bolt and nut assembly 44, the mounting bolt being disposed in the mounting bolt holes 40 of the mounting blocks 36 and the mounting bolt holes 42 in the sleeve 38. The boom 12 also comprises a brace structure 46, see FIG. 1. The brace structure 46 comprises a short compression rod 48 and a pair of tension rods 50 and 52. The compression rod 48 is vertically mounted as by weldment to the top of the main pipe 20 between the mounting blocks 36. One tension rod 50 is secured as by weldment to the upper end of the compression rod 48 and at the other end to the main pipe 20 in the region of its fulcrum end. The other tension rod 52 is secured as by weldment to the upper end of the compression rod 48 and at the other end to the main pipe 20 in the region of its load carrying end.

The hydraulic jack 14 is of conventional construction. As depicted in FIG. 4 it comprises a noramlly vertically disposed enclosed, hydraulic cylinder 54 having in the region of the bottom end thereof an inlet 56 (see FIGS. 2 and 4) for hydrallic fiuid, a piston (not shown) in said cylinder 54 and a longitudinally disposed lift rod 58. The lift rod extends from the top of said piston through the top end of said cylinder 54 to a lift head 60. The hydraulic fluid inlet 56 of the cylinder 54 is cou led to one end of a hydraullic fluid hose 62, the other end of which is coupled to the outlet 64 (see FIGS 1 and 2) of a hydraulic fluid pump 66. The internal construction of the hydraulic fluid pump 66 is conventional and, therefore, need not be described in detail. The external construction of the hydraulic fluid pump 66 is likewise conventional, comprising a pump cylinder 68, a pump handle 70 and a release valve 72 for admitting hydraulic fluid from the hydraulic fluid hose 62 and thus the hydraulic cylinder 54 of the jack 14 back into the hydraulic fluid pump 66.

The lift head 60 as shown in FIG. 4 is a cylindrical block with its longitudinal axis normally vertically disposed and in line with that of the lift rod 58 of the hydraulic jack 14. The bottom end of the lift head 60 rests on the top end of the lift rod 58. Secured asby weldment to the bottom portion of the cylindrical periphery of the lift head 60 and extending downwardly around the hydraulic cylinder 54, but spaced therefrom is a cylindrical skirt 74. Abutting the top end of the cylindrical skirt 74 is the bottom end of the mounting sleeve 38 of the boom 12. See FIGS 4 and 6. The mounting sleeve 38 is mounted in sliding fit on the top portion of the lift head 60 and, if desired, can be secured thereto as by a set screw 78.

The bottom of the hydraulic cylinder 54 of the jack 14 rests on a base 80 inside a sump ring 82 attached as by weldment to the base 80. See FIGS. 1 and 4. The base 80 is a horizontally disposed inverted channel-type beam member of the frame 18. In addition to the beam or base 80, the frame 18 comprises a pair of vertically disposed channel members 84 and 86, one channel member 84 being on one side of the hydraulic cylinder 54 with the flanges thereof facing the hydraulic cylinder 54, the other channel member 86 being on the other side of said hydraulic cylinder 54 with its flanges facing the hydraulic cylinder 54. The bottom ends of the upright channel members 84 and 86 are fastened by weldments to the horizontal beam 80. The top ends of the upright channel members 84 and 86 are secured as by weldments to a horizontally disposed cap plate 88 (FIGS. 1 and 3) with an opening 90 therethrough for the cylindrical skirt 74. The cap plate 88 comprises a bearing member 92 (FIG. 3) on the front, inside wall forming the opening 90. The cylindrical skirt 74 slides against the bearing member 92 moving upwardly and downwardly. On top of the cap plate 88 and secured thereto as by weldments are a pair of roller brackets 94 and 96 in which are mounted for rotation on horizontal axes rollers 98 and 100. The brackets 94 and 96 are positioned to the side and rearwardly of the cylindrical skirt 74 and are arranged so that the rollers bear against the cylindrical skirt 74 and help in supporting it and thrusting it against the bearing member 92.

The hydraulic pump 66 as shown in FIGS. 1-3 is mounted as by weldment on the side of one (84) of the upright channel members 84 and 86.

The portable hoist also comprises as part of the frame 18 a carriage structure. The carriage structure (see FIGS. 1 and 2) comprises a pair of rearwardly and sidewise extending arms 102 and 104, near the outer ends of which are swivelly mounted downwardly extending casters 106 and 108. The inner ends of these arms 102 and 104 are attached as by weldments to the sides of the upright channel members 84 and 86. In addition, the carriage structure comprises forwardly and slightly sidewise extending, elongated arms 110 and 112. The outer ends of the elongated arms 110 and 112 have secured thereto as by weldments U-shaped brackets in which are rotatably mounted wheels 114 and 116 on horizontal shafts carried by said brackets. The rearward portions of the elongated arms 114 and 116 are disposed along the bottom portion of the upright channel members 84 and 86, are attached as by weldments to the undersides of the rearwardly and sidewise extending arms 102 and 104. The rear ends of the elongated arms 114 and 116 are fastened as by weldments to a rear cross bar 118 (FIG. 2) disposed on the back side of the upright channel members 84 and 86. To aid in moving the portable hoist 10 into position and from one place to another, there are also provided a pair of sidewise extending handle bars 119 (FIG. 1) secured 'as by weldment to the sides of the upright channels 84 and 86 of the frame 18.

Secured as by weldments to the rear cross bar 118 midway between the ends thereof are a pair of vertically disposed bracket members 120 and 122 which are horizontally spaced apart a sufficient distance to receive at least in sliding fit the bottom end of the fulcrum bar 16. The bracket members 120 and 122 have oppositely disposed and horizontally disposed bolt holes 124.

The fulcrum bar 16 extends from between the bracket members 120 and 122 to the space 22 provided therefor in the fulcrum end region of the main pipe 20 of the boom 12. In the region of the bottom end of the fulcrum bar 16 there is a retainer bolt hole 126 which, with the fulcrum bar 16 in position, is in horizontal alignment with the retainer bolt holes 124 of the bracket members 120 and 122. A retainer bolt and nut assembly 128 with the retainer bolt disposed through the retainer bolt holes 124 of the bracket members 120 and 122 and the retainer bolt hole 126 in the fulcrum bar 16 pivotally secures the bottom end of the fulcrum bar 16 to the cross bar 118 of the frame 18. In the region of the top end of the fulcrum bar 16 there is a retainer bolt hole 129 which, with the fulcrum bar 16 in position, is in horizontal alignment with the retainer bolt holes 23 in the pipe 20 wall on each side of the space 22. A retainer bolt and nut assembly 130 with the retainer bolt disposed through the retainer bolt holes 23 in the pipe 20 wall and the retainer bolt hole 129 of the fulcrum bar 16 pivotally secured the top end of the fulcrum bar 16 to the fulcrum end portion of the main pipe 20 of the boom 12.

An alternative lift structure in the portable hoist 10 of the drawings is a fork arm structure 132 (FIGS. 1 and 2). The fork arm structure 132 comprises a bracket 134. The bracket 134, positioned forwardly of the upright channels 84 and 86 of the frame 18 has a pair of rear- Wardly extending side plates 136 and 138 (FIGS. 1, 2 and 4) which are secured in the region of the rear ends thereof as by weldments to the bottom portion of the cylindrical skirt 74. Each side plate of the bracket has an outwardly sidewise extending stud on which is rotatably mounted a rear roller 140. The rear rollers 140 in each case are disposed in the corresponding upright channels 84 and 86. The outside diameter of the rear roller 140 in each case is such that the roller rollingly contacts the inwardly extending flanges of the upright channels 84 and 86. Forwardly of the rollers 140 the side plates 136 and 138 also comprise sidewise extending studs on which are rotatably mounted front rollers 142. The outside diameter of the front rollers 142 are such that the front rollers 142 rollingly contact the front sides of the corresponding flanges of the upright channels 84 and 86. Forwardly of the upright channels 84 and 86, the side plates 136 and 138 are secured as by weldments to sidewise and slightly forwardly extending horizontal side arms 144 and 146. Pivotally mounted on the horizontal side arms 144 and 146 for front to rear horizontal movement are fork arms. The outer ends of the fork arms 148 and 150 have rotatably mounted thereon vertically disposed automobile chassis support members 152 and 154.

In the portable hoist 10 shown in FIG. 1 the boom 12 is in a raised position. To lower it into a load engaging position the release valve 72 on the hydraulic pump 66 is placed into release position whereupon the lift rod 58 and thus the lift head 60 is lowered. This brings the load end of the boom 12 down. i

To lift a load attached to the hook 34 at the load end of the boom 12, the release valve 72 on the hydraulic pump 66 is turned to lift position and the pump handle 70 is worked whereby hydraulic fluid is pumped from the hydraulic pump 66 into the hydraulic cylinder 54. The piston and the attached lift rod 58 is raised in the hydraulic cylinder 54 of the jack 14. This causes the lift head 60 to move upwardly and in turn to lift the boom 12 at the mounting blocks 36, which can be regarded as the power point of the boom 12. However, because of the relatively fixed position of the fulcrum point of the boom, the load end of the boom is elevated to a higher extent than at the lower point of the boom. In this connection, generally the distance from the load carrying part of the boom 12 to the power point is greater than the distance from the power point to the fulcrum point of the boom. With the load attached to the hook 34 and the boom 12 in elevated position, the hoist can then be moved by pushing or pulling on the handle bars 119 to any desired location.

The fork arm structure 132 is raised along with the load end of the boom 12. Consequently, the two can be employed simultaneously. To use the fork arm structure 132 starting at lowered position, the fork arms 148 and 150 are swung into position underneath an automobile chassis, for example, and the portable hoist 10 is maneuvered until the support members 152 and 154 are at the desired locations. The pump handle 70 is worked to lift the piston and thus the lift rod 58 of the hydraulic jack 14. As the lift rod 58 and the lift head 60 are elevated, so also is the fork arm bracket 134 and the fork arms 148 and 150. To lower the fork arms 148 and 150 the release valve 72 on the hydraulic pump 66 is placed in release position, thereby permitting hydraulic fluid to flow back into the hydraulic pump 66, allowing the lift rod 58 and associated lift head 60 to move downwardly, whereby, the fork iarm bracket structure 132 is lowered.

Thus, this invention provides a readily maneuverable, easily operated, portable hoist. The hoist is constructed from readily available parts. Moreover, it offers simplicity of construction and economies of manufacture.

These and other features, advantages and specific embodiments will be readily apparent to those in the exercise of ordinary skill in the art after reading the foregoing disclosures. In this regard, while a specific embodiment of this invention has been described in considerable detail, variations and modifications of this embodiment can be effected without departing from the spirit and scope of this invention as disclosed and claimed.

I claim:

1. A portable hoist which comprises: (1) a generally horizontally disposed boom, comprising a main pipe having a fulcrum end and an open, load carrying end, said main pipe in the region of said fulcrum end being adapted to receive the top end portion of a fulcrum bar and pivotal connection means therefor, said main pipe between said ends having attached thereto a pair of downwardly extending mounting blocks, one on one side of said main pipe, the other on the other side of said main pipe with a round mounting sleeve disposed between said mounting blocks underneath said main pipe with means pivotally connecting said mounting sleeve to said mounting blocks, said main pipe further comprising a brace structure on the top side thereof; (2) a hydraulic jack comprising a vertically disposed hydraulic cylinder having a hydraulic fluid inlet in the region of the bottom end thereof and containing a piston between said inlet and the top end there-of, a vertically disposed lift rod connected to said piston and extending from the top side of said piston through the top end of said hydraulic cylinder to a cylindrical lift head above said cylinder, the axis of said cylindrical lift head being vertically disposed, said mounting sleeve being mounted on said lift head, and a vertically disposed cylindrical skirt attached to and extending downwardly from said lift bead and surrounding the upper portion of said hydraulic cylinder, said hydraulic jack further comprising a hydraulie pump with hydraulic fluid release means and a hydraulic fluid outlet, and hydraulic fluid hose means having one end coupled to said outlet and the other end coupled to said hydraulic fluid inlet of said hydraulic cylinder; (3) frame means comprising a base supporting said hydraulic cylinder at its bottom end, upright columns on each side of said hydraulic cylinder with the bottom. ends thereof being attached to said base, top plate means attached to the top ends of said upright columns, said top plate means having an opening therethro ugh for said cylindrical skirt, pairs of forwardly and laterally projecting horizontally disposed arms secured to the opposite outer sides of said upright columns, the other fastened to the other upright column, wheel means rotatably mounted on the outer ends of said arms, a cross bar member attached to the inner ends of said forwardly projecting arms and disposed on the rear side of said upright columns, said cross bar member comprising bracket means for receiving the bottom end portion of a fulcrum bar; and (4) a fulcrum bar extending from said bracket means to the portion of said main pipe of said boom adapted to receive the top end portion of said fulcrum bar, means pivotally connecting the bottom end portion of said fulcrum bar to said bracket means and means pivotally connecting the top end portion of said fulcrum bar to said main pipe.

2. A portable hoist according to claim 1 in which said main pipe has a vertically reinforcing brace structure on its upper side.

3. A portable hoist according to claim 2 wherein said brace structure comprises a vertically disposed short compression bar attached to the top of said main pipe in the region of said mounting blocks, a tension bar with one end attached to the top of the main pipe in the fulcrum end region thereof and the other end attached to the top of said compression bar, and another tension bar with one end attached to the top of the main pipe in the load carrying end region thereof and the other end attached to the top of said compression bar.

4. A portable hoist according to claim 1 wherein said boom comprises an extension pipe with a portion thereof concentrically disposed in said main pipe and extending outwardly therefrom and removable means securing said extension pipe to said main pipe.

5. A portable hoist according to claim 1 wherein said top plate means comprises on the front side of said opening for said cylindrical skirt a bearing plate against which said cylindrical skirt slides in moving up and down and roller means sidewise and rearwise mounted relative to said cylindrical skirt with horizontal axes of rotation, said roller means rollingly bearing against said cylindrical skirt.

References Cited by the Examiner UNITED STATES PATENTS 2,528,329 10/1950 Bauer 254-8 X 2,605,002 7/1952 Graves 2128 2,868,501 l/l959 Cloud et al. 2542 2,974,490 3/1961 Hott 2542 X 2,985,142 5/1961 Aiden 2128 X 3,059,785 10/1962 Buckete 2548 X 3,130,956 4/1964 Mandelko 2542 3,222,029 12/ 1965 Hildemann 2548 FOREIGN PATENTS 1,341,634 9/ 1963 France.

WILLIAM FELDMAN, Primary Examiner.

MILTON S. MEHR, Examiner. 

1. A PORTABLE HOIST WHICH COMPRISES: (1) A GENERALLY HORIZONTALLY DISPOSED BOOM, COMPRISING A MAIN PIPE HAVING A FULCRUM END AND AN OPEN, LOAD CARRYING END, SAID MAIN PIPE IN THE REGION OF SAID FULCRUM END BEING ADAPTED TO RECEIVE THE TOP END PORTION OF A FULCRUM BAR AND PIVOTAL CONNECTION MEANS THEREOF, SAID MAIN PIPE BETWEEN SAID ENDS HAVING ATTACHED THERETO A PAIR OF DOWNWARDLY EXTENDING MOUNTING BLOCKS, ONE ON ONE SIDE OF SAID MAIN PIPE, THE OTHER ON THE OTHER SIDE OF SAID MAIN PIPE WITH A ROUND MOUNTING SLEEVE DISPOSED BETWEEN SAID MOUNTING BLOCKS UNDERNEATH SAID MAIN PIPE WITH MEANS PIVOTALLY CONNECTING SAID MOUNTING SLEEVE TO SAID MOUNTING BLOCKS, SAID MAIN PIPE FURTHER COMPRISING A BRACE STRUCTURE ON THE TOP SIDE THEREOF; (2) A HYDRAULIC JACK COMPRISING A VERTICALLY DISPOSED HYDRAULIC CYLINDER HAVING A HYDRAULIC FLUID INLET IN THE REGION OF THE BOTTOM END THEREOF AND CONTAINING A PISTON BETWEEN SAID INLET AND THE TOP END THEREOF, A VERTICALLY DISPOSED LIFT ROD CONNECTED TO SAID PISTON AND EXTENDING FROM THE TOP SIDE OF SAID PISTON THROUGH THE TOP END OF SAID HYDRAULIC CYLINDER TO A CYLINDRICAL LIFT HEAD ABOVE SAID CYLINDER, THE AXIS OF SAID CYLINDRICAL LIFT HEAD BEING VERTICALLY DISPOSED, SAID MOUNTING SLEEVE BEING MOUNTED ON SAID LIFT HEAD, AND A VERTICALLY DISPOSED CYLINDRICAL SKIRT ATTACHED TO AND EXTENDING DOWNWARDLY FROM SAID LIFT HEAD AND SURROUNDING THE UPPER PORTION OF SAID HYDRAULIC CYLINDER, SAID HYDRAULIC JACK FUTHER COMPRISING A HYDRAULIC PUMP WITH HYDRAULIC FLUID RELEASE MEANS AND A HYDRAULIC FLUID OUTLET, AND HYDRAULIC FLUID HOSE MEANS HAVING ONE END COUPLED TO SAID OUTLET AND THE OTHER END COUPLED TO SAID HYDRAULIC FLUID INLET OF SAID OTHER END COUPLED (3) FRAME MEANC COMPRISING A BASE SUPPORTING SAID HYDRAULIC CYLINDER AT ITS BOTTOM END, UPRIGHT COLUMNS ON EACH OF SAID HYDRAULIC CYLINDER WITH THE BOTTOM ENDS THEREOF BEING ATTACHED TO SAID BASE, TOP PLATE MEANS ATTACHED TO THE TOP ENDS OF SAID UPRIGHT COLUMNS, SAID TOP PLATE MEANS HAVING AN OPENING THERETHROUGH FOR SAID CYLINDRICAL SKIRT, PAIRS OF FORWARDLY AND LATERALLY PROJECTING HORIZONTALLY DISPOSED ARMS SECUED TO THE OPPOSSITE OUTER SIDES OF SAID UPRIGHT COLUMNS, THE OTHER FASTENED TO THE OTHER UPRIGHT COLUMN, WHEEL MEANS ROTATABLY MOUNTED ON THE OUTER ENDS OF SAID ARMS, A CROSS BAR MEMBER ATTACHED TO THE INNER ENDS OF SAID FORWARLDY PROJECTING ARMS AND DISPOSED ON THE REAR SIDE OF SAID UPRIGHT COLUMNS, SAID CROSS BAR MEMBER COMPRISING BRACKET MEANS FOR RECEIVING THE BOTTOM END PORTION OF A FULCRUM BAR; AND (4) A FULCRUM BAR EXTENDING FROM SAID BRACKET MEANS TO THE PORTION OF SAID MAIN PIPE OF SAID BOOM ADAPTED TO RECEIVE THE TOP END PORTION OF SAID FULCRUM BAR, MEANS POVOTALLY CONNECTING THE BOTTOM END PORTION OF SAID FULCRUM BAR TO SAID BRACKET MEANS AND MEANS PIVOTALLY CONNECTING THE TOP END PORTION OF SAID FULCRUM BAR TO SAID MAIN PIPE. 